destroy-pr-environment

#!/usr/bin/env bash
# -----------------------------------------------------------------------------
# Destroy the temporary environment that was created for the pull request.
#
# Positional parameters:
#   app_name (required) – the name of subdirectory of /infra that holds the
#     application's infrastructure code.
#   environment - the name of the application environment (e.g. dev, staging, prod)
#   pr_number - the pull request number in GitHub
# -----------------------------------------------------------------------------
set -euo pipefail

app_name="$1"
environment="$2"
pr_number="$3"

workspace="p-${pr_number}"

echo "::group::Initialize Terraform with backend for environment: ${environment}"
terraform -chdir="infra/${app_name}/service" init -backend-config="${environment}.s3.tfbackend"
echo "::endgroup::"

echo "Select Terraform workspace: ${workspace}"
terraform -chdir="infra/${app_name}/service" workspace select "${workspace}"

echo "::group::Destroy resources"
terraform -chdir="infra/${app_name}/service" destroy -var="environment_name=${environment}" -input=false -auto-approve
echo "::endgroup::"

echo "Select default workspace"
terraform -chdir="infra/${app_name}/service" workspace select default

echo "Delete workspace: ${workspace}"
terraform -chdir="infra/${app_name}/service" workspace delete "${workspace}"

pr_info=$(cat <<EOF
<!-- ${app_name} - begin PR environment info -->
## Preview environment for ${app_name}
♻️ Environment destroyed ♻️
<!-- ${app_name} - end PR environment info -->
EOF
)

pr_body="$(gh pr view "${pr_number}" --json body | jq --raw-output .body)"

# clean up older single-app section if present
if [[ $pr_body == *"<!-- begin PR environment info -->"*"<!-- end PR environment info -->"* ]]; then
  pr_body="${pr_body//<!-- begin PR environment info -->*<!-- end PR environment info -->}"
fi

if [[ $pr_body == *"<!-- ${app_name} - begin PR environment info -->"*"<!-- ${app_name} - end PR environment info -->"* ]]; then
  pr_body="${pr_body//<!-- ${app_name} - begin PR environment info -->*<!-- ${app_name} - end PR environment info -->/$pr_info}"
else
  pr_body="${pr_body}"$'\n\n'"${pr_info}"
fi

echo "Update PR description with PR environment info"
echo "${pr_info}"
gh pr edit "${pr_number}" --body "${pr_body}"